1 last question about these 2 overexposed on this forum. Both are 15TL. Serial 105 is single button. Serial 14000 I think 1941. It is waterproof first advertised 1940 and without Incabloc balance mount that was first used after 1942. Is 105 fifth one made? It was first used by Omega in 1932. Can I say it is 1931? Did Omega start using new Lemanias same time Lemania first sold these?